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subgrade — [sub′grād΄] n. a layer of rock or earth leveled and graded for a foundation, as of a road … English World dictionary

Subgrade — In highway engineering, subgrade is the native material underneath a constructed pavement. It is also called formation level. Explanation Subgrades are commonly compacted before the construction of a pavement, and are sometimes stabilized by the… … Wikipedia

subgrade — ˈsəb+ˌ noun Etymology: sub + grade 1. : a subordinate level in a scale (as of rank or quality) subgrade is used in some classifications at a supraphylar level 2. : a layer (as a stratum or surface) immediately beneath some principal layer;… … Useful english dictionary

subgrade — /sub grayd /, Civ. Engin., Building Trades. n. 1. the prepared earth surface on which a pavement or the ballast of a railroad track is placed or upon which the foundation of a structure is built. adj. 2. beneath the finished ground level of a… … Universalium

subgrade — noun The layer of native soil on which the foundation of a road is laid … Wiktionary

pavement subgrade — The upper part of the soil, natural or constructed, that supports the load transmitted by the runway pavement structure. See pavement structure … Aviation dictionary

Track (rail transport) — Permanent way redirects here. For other uses, see Permanent way (disambiguation). Twin rail tracks in a wooded area … Wikipedia

Road surface — A road in the process of being resurfaced Road surface (British English) or pavement (American English) is the durable surface material laid down on an area intended to sustain vehicular or foot traffic, such as a road or walkway. In the past… … Wikipedia